Alright, let's work through 84368839 times 16320471 step by step
84368839 × 16320471 = 16320471 × (84368839)
+ 16320471 × 9 that is equal 146884239
+ 16320471 × 30 that results in 489614130
+ 16320471 × 800 that results in 13056376800
+ 16320471 × 8000 that is equal 130563768000
+ 16320471 × 60000 what gives us 979228260000
+ 16320471 × 300000 producing 4896141300000
+ 16320471 × 4000000 that results in 65281884000000
+ 16320471 × 80000000 that results in 1305637680000000

= 1376939190203169
